headers: Drop nonstandard null.h and size_t.h.

They're holdovers from R5. <stddef.h> should just be included instead,
and ssize_t declared directly in sys/types.h.

headers/posix/locale.h

@@ -7,7 +7,8 @@
 
 
 #include <locale_t.h>
-#include <null.h>
+#include <stddef.h>
+
 
 struct lconv {
 	char *decimal_point;

headers/posix/null.h

@@ -1,12 +0,0 @@
-/*
- * Copyright 2008-2012 Haiku, Inc. All Rights Reserved.
- * Distributed under the terms of the MIT License.
- */
-#ifndef _NULL_H
-#define _NULL_H
-
-#ifndef NULL
-	#define NULL 0
-#endif
-
-#endif

headers/posix/size_t.h

@@ -1,19 +0,0 @@
-/*
- * Copyright 2008-2012 Haiku, Inc. All Rights Reserved.
- * Distributed under the terms of the MIT License.
- */
-#ifndef _SIZE_T_H_
-#define _SIZE_T_H_
-
-
-#include <stddef.h>
-
-
-/* ATM we don't define ssize_t for GCC2 */
-#if __GNUC__ > 2 && !defined(__ssize_t__)
-#	define __ssize_t__
-typedef long signed int	ssize_t;
-#endif
-
-
-#endif	/* _SIZE_T_H_ */

headers/posix/stdio.h

@@ -7,7 +7,6 @@
 
 
 #include <sys/types.h>
-#include <null.h>
 #include <stdarg.h>
 
 

headers/posix/stdlib.h

@@ -9,11 +9,11 @@
 #include <alloca.h>
 #include <div_t.h>
 #include <limits.h>
-#include <stddef.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <wchar_t.h>
 
+
 #define RAND_MAX      0x7fffffff
 #define MB_CUR_MAX    (__ctype_get_mb_cur_max())
 

headers/posix/sys/types.h

@@ -1,14 +1,14 @@
 /*
- * Copyright 2002-2012 Haiku, Inc. All Rights Reserved.
+ * Copyright 2002-2026, Haiku, Inc. All rights reserved.
  * Distributed under the terms of the MIT License.
  */
 #ifndef _SYS_TYPES_H
 #define _SYS_TYPES_H
 
 
-#include <config/types.h>
-
 #include <BeBuild.h>
+#include <config/types.h>
+#include <stddef.h>
 
 
 /* BSD compatibility */
@@ -18,13 +18,18 @@ typedef unsigned short 		u_short;
 typedef unsigned char 		u_char;
 
 
-/* sysV compatibility */
+/* SysV compatibility */
 typedef unsigned long 		ulong;
 typedef unsigned short 		ushort;
 typedef unsigned int 		uint;
 typedef unsigned char		unchar;
 
 
+#if __GNUC__ > 2 && !defined(__ssize_t__)
+#define __ssize_t__
+typedef long signed int	ssize_t;
+#endif
+
 typedef __haiku_int64 		blkcnt_t;
 typedef __haiku_std_int32	blksize_t;
 typedef __haiku_int64		fsblkcnt_t;
@@ -43,9 +48,9 @@ typedef __haiku_std_uint32	umode_t;
 typedef __haiku_std_int32	nlink_t;
 
 #ifdef __HAIKU_BEOS_COMPATIBLE_TYPES
-	typedef int		daddr_t;	/* disk address */
+typedef int		daddr_t;	/* disk address */
 #else
-	typedef off_t	daddr_t;	/* disk address */
+typedef off_t	daddr_t;	/* disk address */
 #endif
 typedef char*				caddr_t;
 
@@ -122,8 +127,6 @@ struct _pthread_spinlock {
 };
 
 
-#include <null.h>
-#include <size_t.h>
 #include <time.h>
 
 #endif

headers/posix/unistd.h

@@ -6,7 +6,6 @@
 #define _UNISTD_H_
 
 
-#include <null.h>
 #include <stdint.h>
 #include <sys/types.h>
 

headers/private/file_systems/DebugSupport.h

@@ -51,7 +51,6 @@
 #	endif
 #else
 #	include <KernelExport.h>
-#	include <null.h>
 #	if DEBUG_PRINT
 #		define __out dbg_printf
 #		define __outv dbg_vprintf

headers/private/userlandfs/shared/Debug.h

@@ -44,7 +44,6 @@
 #	endif
 #else
 #	include <KernelExport.h>
-#	include <null.h>
 #	if DEBUG_PRINT
 #		define __out dbg_printf
 #	else